The Sudanese speakers live in the area east of Er Roseires, around Famaka and Fazoglo on the Blue Nile, extending north along the border.
[1] Dimmendaal et al. (2019) suspect that the poorly attested varieties spoken along the river constitute a distinct language, Kadallu.
[2] An early record of this language is a wordlist from the Mount Guba area compiled in February 1883 by Juan Maria Schuver.
Ahland (2004)[5] provides comparative lexical data for the Guba, Mandura, North Dibat'e, Wenbera, Sirba Abay, Agelo Meti, Yaso, and Metemma dialects.
In some dialects, e.g. Sirba, there is a labialized palatalized bilabial stop, as in the word for 'rat' [bʲʷa] (Unseth 1989).